Apollo 21

Apollo 21

"Apollo 21" is an apocryphal reference to an eleventh manned Moon landing mission of NASAs Apollo program. Apollo contracted for the construction of fifteen Saturn V launch vehicles used to launch the Apollo spacecraft to the Moon, and achieved the first manned landing with the sixth one (Apollo 11), leaving nine for follow-on lunar missions, through Apollo 20. However, budget cuts caused NASA to cancel the last three missions, ending the lunar program after Apollo 17. One Saturn V was used to launch the Skylab space station, and parts of the other two became museum displays.

An "Apollo 21" lunar landing mission appears in three twenty-first century works of fiction.